If you’re having your heating and hot water system replaced or upgraded, the engineer might discuss options when it comes to your hot water cylinder. There are two types of stored hot water cylinders – vented (also known as open vented or gravity fed), and unvented.
A vented cylinder has a vent pipe that allows for expansion in the system, it is fed from a cold water cistern tank that’s usually located in the loft. Gravity pulls water from the tank to the vented cylinder.
In contrast, an unvented cylinder is fed directly from the cold mains supply, meaning that there is no need for a tank in the loft space. Thanks to the direct feed from the cold mains supply, unvented cylinder systems benefit from improved pressure and flow rate.
Unvented cylinder hot water systems are typically more expensive to install than open vented systems, and if the cold water mains supply is cut off, you’ll have to go without hot water for a short while. However, there are multiple advantages to having an unvented cylinder in your home:
Unvented hot water systems all function in roughly the same manner:
Unvented hot water systems are incredibly complex, and operate under extreme pressure, so you should never attempt to install one yourself. Only qualified installers are legally allowed to install these systems, so you should always contact a trained and qualified engineer, like our Metro Plumb experts who are available 24/7/365 for boiler and heating system enquiries.
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